Safety device



March 5, 1929. 6. GODDU i-zr AL. 1,704,188

SAFETY DEVI CE Original Fild March 28, 1923 Patented Mar. 5, 1929.

more sreres earnr 1,704,188 O ICE- r snonen scope, on winonns'rnn, AND rnnnn iiiicirnnzin, or BEVERLY, MASSACHU- SET'I'S, ASSIGNORS TO UNITED SHOEIeiLlZ-LCHIIQ'ERY NEW JERSEY, A CORPORATION 013 NEW JERSEY,

oonronerron, on PATERSQN,

SAFETY DEVICE.

Original application filed March 28, 1923,8eria1 No. 628,234. Divided and this application'filed February 2'7, 1928. Serial No. 257,494. 7.

This invention relates to safety devices and particularly to devices for enabling clutch-operated, power-driven machines to be safely turned over by hand while the power is on. v

in various kinds of machines, forexample,

machines for operating upon shoes, it is nee essary, in makingcertain adjustments and repairs, to turn the machine over by hand.

An example of such a machine is the welt.

butting and tacking machine disclosedin our application Serial/No. 628,234, filed March 28,1923, of which this application is a division. In this and similar clutchoperated, power-driven machines it is nee-- essar-y at times, in order to make ad3ustments or repairs, to turn the machine over by hand while the factory power is on. It

is, of course, impracticable to shut down the factory and inconvenient to remove the driving belt. A handle or wrench is provided for turning the shaft of the machine by hand, and devices have been provided for rendering the clutch inoperative. Prior to our invention, however, it has been possible to apply thehandle or wrench whether or not the clutch had been renedered inoperative and hence, if the operator neglectedto render the clutch inoperative before applying the handle or wrench, the machine might be put in operation "by depression of the starting treadle by some one either accii perator or to the machine or both.

An object of the present invention isto provide a safety device, adapted for use in clutch-operated, power-driven machines of the type referred to, which will'render it impossible to apply an iinplement such a handle or wrench for turning the machine over by hand unless and until engagement of the driving and driven clutch elements has been rendered impossible. 7

Accordingly, asherein illustratedin its tion being liable to result in inyury totliei application to a "weltbutting and tacking machine of the type disclosed. in the application above mentioned, the invention provides a safty device for rendering the ma chine clutch inoperative, which device comprises a pin havinga thumb'head wh ch is slabbed olf atone SldQ. The construction is such that when the pin is turned so that shaft projecting from the frame;

its slabbed-off side is nextto the shaft,- the clutch is rendered inoperative even if the this position of the Fig. l is a perspective View of a portionof a machine in which the present invention is embodied, and

t Fig. 2 is a side elevation, tion, of parts shownin Fig. 1.

:Referring to Fig. l, a welt butting and tacking machine, organized as set forth in the application above referred to, is operated by a ,treadle l0 depression of which. pulls downwardly on'a treadl'e rod 12 connected bya pin 14- to an arm '16 carried by a shaft 18; Depression of the treadle swings the arm 16 into engagementwith the forward end of a lever 20 fulcrumed ona fixed stud 22 projecting froma portion 2a of the frame of/the machine The rear end of the lever spring; I w ith by which the machine is driven. The arm 26 is i-i' raced by biiiurcations on an ilfiiilgl of .sleeve 36 loose on a pin so On the sleeve 20 has pivoted thereto an upright arm theu iper end of which is held by a 28 against a nien'ibor .30 which rotates partly in sec-A I nch can be applied I 36 is a stop arm 40, which, at the end of a r I cycle, engagesa clutch arm 42 and swings it into the position shownagainst a sprino;-

44: (Fig. 2)., In this position of theclutch arm the shaft 32 and the member 30 are disconnected-from continuously driven parts including. a member d6 which is fixed "to a sleeve48 surrounding the shaft 32 and car- 'ying a spiralrgear 00 which is continuously driven when the factory power is on. The clutch arm i2. is fast to" a clutch pin which extends inwardly and cooperates with I periphery. of theinember 46 which forms the driving recesses 54% formed on the inner clutch member. -The' clutchv pin52 is cut away or 'slabbed off on on e siderat' 56 so that.

when the clutch arm 42 is horizontal the pin 52 is freed from the recesses o l. When the clutch arm 42 is freed by the stop arm 40 the spring 44 swings the clutch arm 42 downwardly and rotates the clutch pin 52 to cause it to engage one of the recesses 5 to connect the driving element with the driven element on the shaft 32.

On the arm 26 is a block 58 which, upon upward movement of the rear end of the lever 20 by depression of the treadle, en gages the arm and swings the stop arm away from the clutch arm 42whioh then is swung down by the spring at to set the clutch. As the member 30 rotates, a projection 60 carried by it engages the arm and swings it to release the block 58 from the arm 3-4;, allowing the sleeve to be rotated by a spring to restore the stop arm lO to a position to engage the clutch arm 42 and release the clutch when rota-- tion oi the driven shaft 32 is completed. The stop arm 40 carries a latch 6 1 which engages a notch 66 beneath the clutch arm 42 and prevents reverse movement of the shaft 32. The spring 28 is arranged to pull in a downward and rearward direction between a pin 68 on the arm 26 and a pin 70 projecting rearwardly from the fixed stud 22 so that the arm 26 is held toward the member 30, and the arm 26, as well as the rearward arm of the lever 20 to which I it is connected, will be moved downwardly when the treadle pressure is released. Movement of the lever 20 is limited by a pin '72 on a projection of the lever which engages a hole in the frame 24.

In order that the machine may safely be turned over by hand while the power is on, means shown in Fig. 2 is provided for rendering the clutch arm d2 inoperative. A spring pin has a milled head Mwhich is slabbed oil at one side and has a transverse pin '2'6 extending through it, which pin engages slots of one depth when the head of the pin is in the position shown in Fig. 2 and, when the pin is pulled out by its head 7%, turned 90 degrees and'released, the transverse pin 76 engages slots of a greater depth, allowing aprojeetie-n 78 on the inner end of the pin to lie in the path of a tail 80 formed on the clutch arm 42, which projection then prevents the arm 42 from turning to set the clutch, even if the stop arm l0 is thrown out of engagement with the clutch arm 42. In this position ot the head 74 the slabbedotl side is toward the shaft 32 so that a suitable wrench may machine safeto be turned over by hand,

before he can apply the wrench to the hub 82 so as to turn the shaft 32.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

1. In a power-driven machine having a clutch operable to connect driven parts with a source or power, a safety device for permitting themachine to be turned over by hand while the power is on comprising a rotatable pin and a member movable to eii'ect connection between the driving and driven members of the clutch, said pin being constructed and arranged so that in one position of rotation it will prevent movement of the movable member to set the clutch and permit application (it an implement to turn the machine over and in another position oi its rotation it will permit operation of the movable member to set the clutch and prevent application of said implement.

2. In power-driven machine, a satetv device for permitting the machine to be turned over by hand while the power is on comprising a rotatable spring-pressed pin. means for holding the pin in different posi tions of rotation, aslabliied-off head on said pin by which it may be released and roated, a driving member, driven member,

rotatable means for connecting the driving member to the driven member, a hub on the driven member to which a wrench may be applied to turn the machine by hand only when the head of the pinis positiond with its slabbed-otl side toward the hub, and means on the pin for preventing movement of said rotatable means when the pin is so positioned. I

3. A power-driven machine having a clutch operable to connect driven parts with a source of power, a device for permitting the machine safely to be turned over bv hand while thepowcr is on comprising driving elements, driven elenients including a shall having a hub to which an implement may be appliedby turning the shaft by hand, means for (miner-ling the driving and driven elements, movable means located adjacent to said hub and constructed and ar ranged so that when placed manually in one position the connecting means is rendered inoperative to connect the driving and driven elements and the implement can be applied to the hub and when said movable means is placed in another position said connecting means is rendered operative and the implement can not be applied to the hub to turn the shaft. I

In testimony whereof we have signed on names to this specification.-

GEORGE GODDU. I FRED L. MACKENZIE. 

